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Pumping Liquid Refrigerant- what will work?

So im working on a new project, and trying to pump liquid refrigerant(134A) with a Delta P of 375 PSI, up to 510 +- Flow rate will be between 14-18 GPM. I am having a difficult time tracking down a pump. At first thoughts, i was looking for a gear pump, but people advised me that would not be the best. I received a quote on a Regen turbine pump for 16K USD. That is way too much for this project. I know vane pumps are used regularly at lower pressures, but i believe that may be the best for my application, if one can accommodate high pressures.
Any thoughts you may have are appreciated.

Vane pumps can work at hydraulic pressures up to at least 3000psi that I know of. A power steering pump on a car is usually a vane pump. I used to test those at 3000psi, as the PS system pressure range is 500-3000psi.

This is proposal organic rankine cycle with R134a as working fluid.The overlal efficiency is mostly affected by the pump efficiency. There is no available high efficient pump on the market to pump 0,01ml/h of R134a at pressure difference 9.55 bar.
I would apreciate any suggestion regarding the pump with higher efficiency ratio at this scale.Microgenerationconcepts

Greetings from USA, i have successfully created a sustainable liquid refrigerant pumping system that incorporates a sealed pump design. It is currently in use in a medium sized refrigeration system, in cool weather it saves an incredible amount of electric near 30% according to the amp-meter. It incorporates liquid injection pre-condensor, and a plc controlled pump combined modulated via pressure differential sensor data. It allows the head pressures to run near 70psig with NO flash gas present. If anyone serious is interested in partnering with me contact me and i will show you what progress has been accomplished. Not to sound bigheaded but for purpose of explanation I have basically done what Hysave could not do in a cost effective more applicable way.

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